<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const xxx = 'sex'
      const obj = {
        name: 'zs',
        ['age']: 19, // 对象的[]中既可以写字符串,也可以写变量
        [xxx]: 0, // ==> ['sex']: 0 ==> sex: 0
      }

      console.log(obj.name)
      console.log(obj['name'])
      console.log(obj)
    </script>
  </body>
</html>
